Search for resonant and non-resonant Higgs boson pair production in the ${b\bar{b}\tau^+\tau^-}$ decay channel in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

, The ATLAS collaboration and Barton, Adam Edward and Bertram, Iain Alexander and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Fox, Harald and Henderson, Robert Charles William and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Muenstermann, Daniel Matthias Alfred and Parker, Adam Jackson and Ristić, B. and Smizanska, Maria and Tee, Amy and Walder, James William and Wharton, Andrew Mark and Whitmore, Ben (2018) Search for resonant and non-resonant Higgs boson pair production in the ${b\bar{b}\tau^+\tau^-}$ decay channel in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector. Physical review letters, 121 (19). ISSN 1079-7114

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Abstract

A search for resonant and non-resonant pair production of Higgs bosons in the $b\bar{b}\tau^+\tau^-$ final state is presented. The search uses 36.1 fb$^{-1}$ of $pp$ collision data with $\sqrt{s}$ = 13 TeV recorded by the ATLAS experiment at the LHC in 2015 and 2016. Decays of the $\tau$-lepton pairs with at least one $\tau$-lepton decaying to final states with hadrons and a neutrino are considered. No significant excess above the expected background is observed in the data. The cross-section times branching ratio for non-resonant Higgs boson pair production is constrained to be less than 30.9 fb, 12.7 times the Standard Model expectation, at 95% confidence level. The data are also analyzed to probe resonant Higgs boson pair production, constraining a model with an extended Higgs sector based on two doublets and a Randall--Sundrum bulk graviton model. Upper limits are placed on the resonant Higgs boson pair production cross-section times branching ratio, excluding resonances $X$ in the mass range 305 GeV < $m_X$ < 402 GeV in the simplified hMSSM minimal supersymmetric model for $\tan\beta=2$ and excluding bulk Randall--Sundrum gravitons $G_{KK}$ in the mass range 325 GeV < $m_{G_{KK}}$ < 885 GeV for $k/\overline{M}_{Pl} = 1$.

Item Type: Journal Article
Journal or Publication Title: Physical review letters
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 131265
Deposited By: ep_importer_pure
Deposited On: 13 Feb 2019 15:15
Refereed?: Yes
Published?: Published
Last Modified: 11 Feb 2020 05:02
URI: https://eprints.lancs.ac.uk/id/eprint/131265

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